Systems and methods for implementing haptics for pressure sensitive keyboards

• US 8,674,941 B2
• Filed: 12/29/2010
• Issued: 03/18/2014
• Est. Priority Date: 12/16/2008
• Status: Active Grant

• Current Assignee: Dell Products BV (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Casparian, Mark A., Azor, Frank C.
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): Jansen, II, Michael J
• Application Number:
  US12/930,125
• Publication Number:
  US 20110102326A1
• Time in Patent Office: 1,175 Days
• Field of Search: 345/156, 345/168
• US Class Current: 345/168
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/0202 Constructional details or processes of manufacture of the input device
• CPC Class Codes: H01H 13/702 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
• CPC Class Codes: H01H 13/85 characterised by tactile feedback features
• CPC Class Codes: H01H 2201/036 Variable resistance
• CPC Class Codes: H01H 2215/05 electromechanical
• CPC Class Codes: H01H 2215/052 piezoelectric
• CPC Class Codes: H01H 2225/03 Different type of switches
• CPC Class Codes: H01H 2239/006 Containing a capacitive switch or usable as such
• CPC Class Codes: H03K 17/975 using a capacitive movable element
• CPC Class Codes: H03K 2217/96062 with tactile or haptic feedback

Abstract

Systems and methods are employed for implementing haptics for pressure sensitive keyboards, such as the type of keyboards having keys that produce alternating digital open/short signals that emulate actuation of conventional “momentary on” digital keys. The disclosed systems and methods may be implemented to provide haptics for both touch typing and variable pressure sensitive operation of a pressure sensitive keyboard. Users of a variable pressure keyboard may be provided with a variable pressure haptics effect, e.g., to enable the user to intuitively understand from the haptics vibration produced by the key how much pressure they are applying to a given key at any given time. Vibration characteristics (e.g., vibration rate, vibration waveform pattern, etc.) of a given pressed key may be varied in real time in coordination with, or in response to, corresponding changes in user pressure applied to the same given key.

Claims

1. A keyboard system, comprising:

one or more pressure sensitive keys configured to provide analog output signals corresponding to each given one of the pressure sensitive keys that is representative of the level of pressure applied to the given key during a key pressure application event of a given applied pressure level;

pressure sensing interface circuitry coupled to receive the analog output signal from each given one of the pressure sensitive keys, the pressure-sensing interface circuitry being configured to simultaneously provide both haptics key pressure indication signals and separate digital key emulation key pressure indication signals by respective separate signal paths and responsive to each of the same given key pressure application events applied to the corresponding same given one of the pressure sensitive keys, the haptics key pressure indication signals and separate digital key emulation key pressure indication signals both being representative of at least two respective different levels of pressure applied to the corresponding given one of the pressure sensitive keys, the at least two different levels of pressure comprising at least first and second different levels of pressure; and

haptics actuation circuitry coupled and configured to impart a variable haptics motion characteristic independently to each given one of the pressure sensitive keys in response to each given key pressure application event based at least in part on the haptics key pressure indication signals provided by the pressure sensing interface circuitry corresponding to the pressure level applied to the corresponding given one of the pressure sensitive keys during each given key pressure application event such that a first haptics motion is imparted to a given one of the pressure sensitive keys at the first pressure level applied during a first key pressure application event to the given one of the pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the pressure sensitive keys at the second pressure level applied during a second and different key pressure application event to the given one of the pressure sensitive keys; and

where the pressure sensing interface circuitry is coupled to provide the haptics key pressure indication signals to the haptics actuation circuitry in response to the given key pressure application events;

where the pressure sensing interface circuitry is configured for coupling to provide a digital key emulation key pressure indication signal corresponding to a given key pressure application event to a keyboard controller that is separate from the haptics actuation circuitry and the pressure sensing interface circuitry at the same time that the pressure sensing interface circuitry provides a separate haptics key pressure indication signal corresponding to the same given key pressure application event to the haptics actuation circuitry; and

where each given one of the pressure sensitive keys comprises a keycap and separate haptics actuation circuitry, the separate haptics actuation circuitry for each given keycap comprising a separate piezo transducer coupled to separately vibrate the given keycap; and

wherein the pressure sensing interface circuitry is coupled to a legacy digital keyboard controller through switching circuitry; and

wherein the switching circuitry is configured to convert a high/low digital output stream into a stream of alternating opens and shorts using a separate optoisolator or transistor provided for each corresponding pressure sensitive analog key switch location.

2. The keyboard system of claim 1, further comprising:

haptics control circuitry separate from the keyboard controller and the pressure sensing interface circuitry, the haptics control circuitry being coupled to receive from the pressure sensing interface circuitry a respective haptics key pressure indication signal representative of pressure applied to each corresponding given one of the pressure sensitive keys during each key pressure application event, the haptics control circuitry being configured to in turn provide a separate haptics control signal corresponding to each given one of the pressure sensitive keys based upon each respective haptics key pressure indication signal received during each corresponding key pressure application event; and

where the haptics actuation circuitry is coupled to receive from the haptics control circuitry the separate haptics control signal corresponding to each given one of the pressure sensitive keys, the haptics actuation circuitry being configured to impart haptics motion independently to each given one of the pressure sensitive keys in response to a received haptics control signal corresponding to the given one of the pressure sensitive keys.

3. The keyboard system of claim 2, where each of the respective digital key emulation key pressure indication signals is a separate alternating open and short (open/short) digital output signal having a frequency that is representative of pressure applied to the corresponding given one of the pressure sensitive keys to emulate toggling of a momentary on/off digital key during the duration of a given key pressure application event of a given applied pressure level;

and where the pressure sensing interface circuitry is further configured to provide to the haptics control circuitry a haptics key pressure indication signal corresponding to each given one of the pressure sensitive keys as a bit stream that is representative of the pressure being applied to the corresponding given one of the pressure sensitive keys during the duration of a given key pressure application event and at the same time that the pressure sensing interface circuitry provides to a keyboard controller that is separate from the haptics control circuitry a digital key emulation key pressure indication signal during the duration of the same given key pressure application event.

4. The keyboard system of claim 3, wherein the pressure sensing interface circuitry is configured for coupling to provide each digital key emulation key pressure indication signal as a separate alternating open/short digital output signal corresponding to each pressure sensitive key to column/row intersections of a legacy keyboard key matrix, the legacy keyboard matrix being operably coupled to a legacy digital keyboard controller having no analog input circuitry;

and where the legacy digital keyboard controller is itself coupled between the pressure sensing interface circuitry and a separate host system device to measure keyboard input for the host device based on received momentary-on digital signals and not based on received analog signals.

5. The keyboard system of claim 4, further comprising a keyboard device body that includes the pressure sensing interface circuitry, the haptics control circuitry and the haptics actuation circuitry;

wherein the keyboard device body is configured to be mechanically coupled as a drop-in keyboard to an information handling system chassis that includes the legacy keyboard controller.

6. The keyboard system of claim 5, wherein the information handling system comprises a notebook computer.

7. The keyboard system of claim 1, further comprising a keyboard device body that includes the one or more pressure sensitive keys and a plurality of digital keys within the keyboard device body, each of the digital keys being coupled to provide a single open/short digital output signal each time the digital key is pressed by a user.

8. The keyboard system of claim 2, wherein the haptics control signal corresponding to each given one of the pressure sensitive keys is a vibration waveform having at least one of a vibration intensity or frequency corresponding to the pressure level being applied in real time to the corresponding given one of the pressure sensitive keys.

9. The keyboard system of claim 8, further comprising memory having multiple vibration waveforms stored therein that are selected to correspond to different pressure force levels applied to the pressure level being applied in real time to the corresponding given one of the pressure sensitive keys;

wherein the haptics control circuitry is configured to respond to receipt of a haptics key pressure indication signal provided by the pressure sensing interface circuitry that is representative of the level of pressure being applied to the corresponding given one of the pressure sensitive keys by retrieving from memory the selected vibration waveform corresponding to the pressure level being applied in real time to the corresponding given one of the pressure sensitive keys, and to provide the selected vibration waveform as the separate haptics control signal to the haptics actuation circuitry; and

wherein the haptics actuation circuitry is configured to impart haptics motion according to the selected vibration waveform independently to the corresponding given one of the pressure sensitive keys being pressed.

10. The keyboard system of claim 9, wherein the haptics key pressure indication signal provided by the pressure sensing interface circuitry to the haptics control circuitry includes the selected waveform memory address that corresponds to the selected vibration waveform corresponding to the pressure level being applied in real time to the corresponding given one of the pressure sensitive keys.

11. The keyboard system of claim 2, comprising a plurality of pressure sensitive keys that are each configured to provide to the pressure sensing interface circuitry a respective separate analog output signal representative of the level of pressure being applied to the given pressure sensitive key;

where the pressure sensing interface circuitry is configured to provide separate respective haptics key pressure indication signals to the haptics control circuitry that are representative of at least two different levels of pressure applied to each individual one of the pressure sensitive keys, the at least two different levels of pressure comprising at least first and second different levels of pressure;

where the haptics control circuitry is configured to provide to the haptics actuation circuitry a separate respective haptics control signal corresponding to each given one of the pressure sensitive keys based upon each respective received haptics key pressure indication signal; and

where the haptics actuation circuitry is configured to separately and independently impart haptics motion to each of the plurality of pressure sensitive keys with a variable haptics motion characteristic based on the applied key pressure level and based on the identity of the received haptics control signal corresponding to each given one of the pressure sensitive keys such that a first haptics motion is imparted to each given one of the pressure sensitive keys at the first pressure level applied to the given one of the plurality of pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the plurality of pressure sensitive keys at the second pressure level applied to the given one of the plurality of pressure sensitive keys.

12. The keyboard system of claim 2, comprising a plurality of pressure sensitive keys that are each configured to provide to the pressure sensing interface circuitry a respective separate analog output signal representative of the level of pressure being applied to the given pressure sensitive key;

where the pressure sensing interface circuitry is configured to simultaneously provide a single common haptics key pressure indication signal to the haptics control circuitry that is representative of at least two different levels of pressure applied to any one of the pressure sensitive keys and to simultaneously provide a separate respective haptics enable signal to allow actuation of only the haptics actuation circuitry corresponding to the identity of each given one of the pressure sensitive keys based upon each respective received haptics key pressure indication signal, the at least two different levels of pressure comprising at least first and second different levels of pressure;

where the haptics control circuitry is configured to provide to all of the haptics actuation circuitry only a single common haptics control signal based upon the received single common key pressure indication signal; and

where the haptics actuation circuitry is configured to separately and independently use the single common haptics control signal to impart haptics motion to only those pressure sensitive keys identified by a corresponding haptics enable signal with a variable haptics motion characteristic based on the applied key pressure level represented by the received common haptics control signal such that a first haptics motion is imparted to each given one of the pressure sensitive keys at the first pressure level applied to the given one of the plurality of pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the plurality of pressure sensitive keys at the second pressure level applied to the given one of the plurality of pressure sensitive keys.

13. The keyboard system of claim 1, wherein the haptics actuation circuitry is configured to impart a variable haptics motion characteristic independently to each given one of the pressure sensitive keys in response to haptics key pressure indication signals that are representative of the at least first and second different levels of pressure applied in real time to the corresponding given one of the pressure sensitive keys, the haptics motion imparted to each given one of the pressure sensitive keys in response to a haptics key pressure indication signal corresponding to the first level of pressure applied to the corresponding given one of the pressure sensitive keys being different than the haptics motion imparted to each given one of the pressure sensitive keys in response to a haptics key pressure indication signal corresponding to the second level of pressure applied to the corresponding given one of the pressure sensitive keys.

14. The keyboard system of claim 1, wherein the haptics actuation circuitry comprises a piezo transducer.

15. The keyboard system of claim 1, where the analog output signal provided to the signal path input of the pressure sensing interface circuitry comprises an individual discharge of a capacitive plate of each given analog key;

where the separate digital key emulation key pressure indication signals provided at the separate second signal output comprise a stream of opens/shorts corresponding to each given analog key; and

where the haptics key pressure indication signals provided at the first signal output comprise a falling edge trigger event.

16. The keyboard system of claim 1, where the switching circuitry comprises optoisolators coupled to provide an electrical control over the make or break (short or open circuit) connection at a given column/row intersection location of keyboard matrix open/short input corresponding to each pressure sensitive analog key switch location.

17. A method of imparting haptics motion, comprising:

providing one or more pressure sensitive keys that comprise a keycap and separate haptics actuation circuitry for each keycap, the separate haptics actuation circuitry for each given keycap comprising a separate piezo transducer coupled to separately vibrate the given keycap;

producing an analog output signal for each given one of the pressure sensitive keys when depressed during a key pressure application event of a given applied pressure level by a user, the analog output signals being representative of the level of pressure applied to the given pressure sensitive key by the user; and

simultaneously providing both haptics key pressure indication signals and separate digital key emulation key pressure indication signals by separate respective signal paths and responsive to each of the same given key pressure application events applied to the corresponding same given one of the pressure sensitive keys, each haptics key pressure indication signal and its simultaneous separate digital key emulation key pressure indication signal both being based upon the same analog output signal and both the haptics key pressure indication signals and separate digital key emulation key pressure indication signals being representative of at least two respective different levels of pressure applied to the given pressure sensitive key by the user, the at least two different levels of pressure comprising at least first and second different levels of pressure;

imparting a variable haptics motion characteristic independently to each given one of the pressure sensitive keys in response to each given key pressure application event based at least in part on a provided haptics key pressure indication signal that is representative of pressure applied to the given pressure sensitive key by the user during each given key pressure application event such that a first haptics motion is imparted to the given one of the pressure sensitive keys at the first pressure level applied during a first key pressure application event to the given one of the pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the pressure sensitive keys at the second pressure level applied during a second and different key pressure application event to the given one of the pressure sensitive keys; and

providing a digital key emulation key pressure indication signal corresponding to a given key pressure application event at the same time as providing a separate haptics key pressure indication signal corresponding to the same given key pressure application event to the haptics actuation circuitry; and

providing pressure sensing interface circuitry, a legacy digital keyboard controller, and switching circuitry coupled between the pressure sensing interface circuitry and the legacy digital keyboard controller;

converting a high/low digital output stream into a stream of alternating opens and shorts using a separate optoisolator or transistor within the switching circuitry for each corresponding pressure sensitive key.

18. The method of claim 17, further comprising:

providing haptics control circuitry and haptics actuation circuitry;

providing pressure-sensing digital interface circuitry that is separate from the haptics control circuitry and haptics actuation circuitry;

receiving the analog output signal from each given one of the pressure sensitive keys in the pressure-sensing interface circuitry;

simultaneously providing both haptics key pressure indication signals and separate digital key emulation key pressure indication signals from the pressure-sensing interface circuitry, each of the separate haptics key pressure indication signals and digital key emulation key pressure indication signals being based upon the same common received analog output signal and being representative of at least two respective different levels of pressure applied to each given corresponding one of the pressure sensitive keys, the at least two different levels of pressure comprising at least first and second different levels of pressure;

receiving each of the separate haptics key pressure indication signals in the haptics control circuitry and providing a separate haptics control signal corresponding to each given one of the pressure sensitive keys based upon each respective received haptics key pressure indication signal;

receiving each separate haptics control signal in the haptics actuation circuitry, and imparting a variable haptics motion characteristic independently to each given one of the pressure sensitive keys in response to a received haptics control signal corresponding to the given one of the pressure sensitive keys such that a first haptics motion is imparted to the given one of the pressure sensitive keys at the first pressure level applied to the given one of the pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the pressure sensitive keys at the second pressure level applied to the given one of the pressure sensitive keys.

19. The method of claim 18, where each of the respective digital key emulation key pressure indication signals is a separate alternating open and short (open/short) digital output signal having a frequency that is representative of pressure applied to the corresponding given pressure sensitive key to emulate toggling of a momentary on/off digital key during the duration of a given key pressure application event of a given applied pressure level;

and the method further comprising providing a haptics key pressure indication signal corresponding to each given one of the pressure sensitive keys to the haptics control circuitry from the pressure sensing interface circuitry, the haptics key pressure indication signal being provided as a digital output bit stream that is representative of the pressure being applied to the corresponding given one of the pressure sensitive keys during the duration of a given key pressure application event and at the same time that the pressure sensing interface circuitry provides to a keyboard controller that is separate from the haptics control circuitry a digital key emulation key pressure indication signal during the duration of the same given key pressure application event.

20. The method of claim 18, further comprising providing a keyboard device body that includes the pressure sensing interface circuitry, haptics control circuitry and haptics actuation circuitry;

providing an information handling system chassis that includes a legacy keyboard key matrix having column/row intersections coupled to a legacy keyboard controller having no analog input circuitry and a host system device coupled to the legacy keyboard controller;

mechanically coupling the keyboard device body as a drop-in keyboard to the information handling system chassis; and

providing each digital key emulation key pressure indication signal as a separate alternating open/short digital output signal corresponding to each pressure sensitive key to column/row intersections of the legacy keyboard key matrix such that the legacy digital keyboard controller is itself coupled between the pressure sensing interface circuitry and the separate host system device to measure keyboard input for the host device based on received momentary-on digital signals and not based on received analog signals.

21. The method of claim 18, further comprising providing the haptics control signal corresponding to each given one of the pressure sensitive keys as a selected vibration waveform having at least one of a vibration intensity or frequency corresponding to the pressure level being applied in real time to the corresponding given one of the pressure sensitive keys;

and using the haptics actuation circuitry to impart haptics motion according to the selected vibration waveform independently to the corresponding given one of the pressure sensitive keys being pressed.

22. The method of claim 18, further comprising:

providing a plurality of pressure sensitive keys;

providing from each of the pressure sensitive keys to the pressure sensing interface circuitry a respective separate analog output signal representative of the level of pressure being applied to the given pressure sensitive key;

providing a separate respective haptics key pressure indication signal from the pressuring sensing interface circuitry to the haptics control circuitry that is representative of at least two respective different levels of pressure applied to each individual one of the pressure sensitive keys, the at least two different levels of pressure comprising at least first and second different levels of pressure;

providing from the haptics control circuitry to the haptics actuation circuitry a separate respective haptics control signal corresponding to each given one of the pressure sensitive keys based upon each respective received haptics key pressure indication signal; and

using the haptics actuation circuitry to separately and independently impart haptics motion to each of the plurality of pressure sensitive keys with a variable haptics motion characteristic based on the applied key pressure level and based on the identity of the received haptics control signal corresponding to each given one of the pressure sensitive keys such that a first haptics motion is imparted to the given one of the pressure sensitive keys at the first pressure level applied to the given one of the pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the pressure sensitive keys at the second pressure level applied to the given one of the pressure sensitive keys.

23. The method of claim 18, further comprising:

providing a plurality of pressure sensitive keys;

providing from each of the pressure sensitive keys to the pressure sensing interface circuitry a respective separate analog output signal representative of the level of pressure being applied to the given pressure sensitive key;

simultaneously providing a single common haptics key pressure indication signal to the haptics control circuitry that is representative of at least first and second different levels of pressure applied to any one of the pressure sensitive keys and simultaneously providing a separate respective haptics enable signal to allow actuation of only the haptics actuation circuitry corresponding to the identity of each given one of the pressure sensitive keys based upon each respective received key pressure indication signal;

providing from the haptics control circuitry to all the haptics actuation circuitry only a single common haptics control signal based upon the received single common key pressure indication signal; and

separately and independently using the single common haptics control signal to impart haptics motion to only those pressure sensitive keys identified by a corresponding haptics enable signal with a variable haptics motion characteristic based on the applied key pressure level represented by the received common haptics control signal such that a first haptics motion is imparted to the given one of the pressure sensitive keys at the first pressure level applied to the given one of the pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the pressure sensitive keys at the second pressure level applied to the given one of the pressure sensitive keys.

24. The method of claim 17, further comprising using imparting a variable haptics motion characteristic independently to each given one of the pressure sensitive keys corresponding to the at least first and second different levels of pressure applied in real time to the corresponding given one of the pressure sensitive keys, the haptics motion imparted to each given one of the pressure sensitive keys in response to a haptics key pressure indication signal corresponding to the first level of pressure applied to the corresponding given one of the pressure sensitive keys being different than the haptics motion imparted to each given one of the pressure sensitive keys in response to a haptics key pressure indication signal corresponding to the second level of pressure applied to the corresponding given one of the pressure sensitive keys.

25. A keyboard system, comprising:

one or more pressure sensitive keys configured to provide analog output signals corresponding to each given one of the pressure sensitive keys that is representative of the level of pressure applied to the given key during a key pressure application event of a given pressure level;

pressure sensing interface circuitry coupled to receive the analog output signal from each given one of the pressure sensitive keys, the pressure-sensing digital output circuitry being configured to provide haptics key pressure indication signals representative of at least two respective different levels of pressure applied to the corresponding given one of the pressure sensitive keys, the at least two different levels of pressure comprising at least first and second different levels of pressure; and

haptics actuation circuitry corresponding to each given one of the pressure sensitive keys and coupled and configured to impart a variable haptics motion characteristic only to a given one of the pressure sensitive keys separately and independently from all of the other pressure sensitive keys based at least in part on the haptics key pressure indication signals provided by the pressure sensing interface circuitry corresponding to the pressure level applied to the corresponding given one of the pressure sensitive keys during a key pressure application event such that a first haptics motion is imparted to a given one of the pressure sensitive keys and not to the other pressure sensitive keys at the first pressure level applied during a first key pressure application event to the given one of the pressure sensitive keys that is different than a second haptics motion that is imparted to the given one of the pressure sensitive keys at the second pressure level applied during a second key pressure application event to the given one of the pressure sensitive keys; and

where the pressure sensing interface circuitry is coupled to provide the haptics key pressure indication signals to the haptics actuation circuitry in response to the given key pressure application events;

and where the system further comprises a respective haptics control switch coupled between the pressure sensing interface circuitry and the separate haptics actuation circuitry corresponding to each individual one of the pressure sensitive keys, each given haptics control switch being configured to allow and disallow application of the single common haptics control signal to the haptics actuation circuitry of a corresponding one of a plurality of pressure sensitive keys based on the respective presence and absence of a haptics enable signal selectively applied by the pressure sensing interface circuitry to the given haptics control switch to allow the single common haptics control signal to selectively impart haptics motions to multiple separate haptics actuation circuitries corresponding to multiple pressure sensitive keys; and

wherein the pressure sensing interface circuitry is coupled to a legacy digital keyboard controller through switching circuitry; and

wherein the switching circuitry is configured to convert a high/low digital output stream into a stream of alternating opens and shorts using a separate optoisolator or transistor provided for each corresponding pressure sensitive analog key switch location.

26. A method of imparting haptics motion, comprising:

providing one or more pressure sensitive keys;

providing haptics control circuitry and separate haptics actuation circuitry corresponding to each individual one of the pressure sensitive keys;

providing pressure-sensing digital interface circuitry;

providing a respective haptics control switch coupled between the pressure sensing interface circuitry and the separate haptics actuation circuitry corresponding to each individual one of the pressure sensitive keys;

producing an analog output signal for each given one of the pressure sensitive keys when depressed during a key pressure application event of a given pressure level by a user, the analog output signals being representative of the level of pressure applied to the given pressure sensitive key by the user;

receiving the analog output signal from each given one of the pressure sensitive keys in the pressure-sensing interface circuitry;

providing a separate haptics key pressure indication signal from the pressure-sensing interface circuitry, each of the separate haptics key pressure indication signals being based upon a corresponding received analog output signal and being representative of at least two respective different levels of pressure applied to each given corresponding one of the pressure sensitive keys, the at least two different levels of pressure comprising at least first and second different levels of pressure;

simultaneously providing a separate respective haptics enable signal to individual haptics control switches to allow actuation of only the haptics actuation circuitry corresponding to the identity of each given one of the pressure sensitive keys based upon each respective received haptics key pressure indication signal;

receiving each of the separate haptics key pressure indication signals in the haptics control circuitry and providing from the haptics control circuitry to all the haptics actuation circuitry only a single common haptics control signal based upon the received single common key pressure indication signal; and

using a respective haptics control switch coupled between the pressure sensing interface circuitry and the separate haptics actuation circuitry corresponding to each individual one of the pressure sensitive keys to allow and disallow application of the single common haptics control signal to the haptics actuation circuitry of a corresponding one of a plurality of pressure sensitive keys based on the respective presence and absence of a haptics enable signal selectively applied by the pressure sensing interface circuitry to the given haptics control switch to allow the single common haptics control signal to be selectively used to impart haptics motions to multiple separate and different haptics actuation circuitries corresponding to multiple pressure sensitive keys; and

providing pressure sensing interface circuitry, a legacy digital keyboard controller, and switching circuitry coupled between the pressure sensing interface circuitry and the legacy digital keyboard controller;

converting a high/low digital output stream into a stream of alternating opens and shorts using a separate optoisolator or transistor within the switching circuitry for each corresponding pressure sensitive key.